Ogonda, Lydia A; Saumonneau, Amélie; Dion, Michel; Muge, Edward K; Wamalwa, Benson M; Mulaa, Francis J; Tellier, Charles Characterization and engineering of two new GH9 and GH48 cellulases from a Bacillus pumilus isolated from Lake Bogoria Article Biotechnology Letters, 43 , p. 691–700, 2021. Résumé | Liens | BibTeX @article{ogondacharacterization,
title = {Characterization and engineering of two new GH9 and GH48 cellulases from a Bacillus pumilus isolated from Lake Bogoria},
author = {Lydia A Ogonda and Amélie Saumonneau and Michel Dion and Edward K Muge and Benson M Wamalwa and Francis J Mulaa and Charles Tellier},
doi = {10.1007/s10529-020-03056-z},
year = {2021},
date = {2021-01-01},
journal = {Biotechnology Letters},
volume = {43},
pages = {691–700},
publisher = {Springer},
abstract = {Objectives. To search for new alkaliphilic cellulases and to improve their efficiency on crystalline cellulose through molecular engineering
Results. Two novel cellulases, BpGH9 and BpGH48, from a Bacillus pumilus strain were identified, cloned and biochemically characterized. BpGH9 is a modular endocellulase belonging to the glycoside hydrolase 9 family (GH9), which contains a catalytic module (GH) and a carbohydrate-binding module belonging to class 3 and subclass c (CBM3c). This enzyme is extremely tolerant to high alkali pH and remains significantly active at pH 10. BpGH48 is an exocellulase, belonging to the glycoside hydrolase 48 family (GH48) and acts on the reducing end of oligo-β1,4 glucanes. A truncated form of BpGH9 and a chimeric fusion with an additional CBM3a module was constructed. The deletion of the CBM3c module results in a significant decline in the catalytic activity. However, fusion of CBM3a, although in a non native position, enhanced the activity of BpGH9 on crystalline cellulose.
Conclusions. A new alkaliphilic endocellulase BpGH9, was cloned and engineered as a fusion protein (CBM3a-BpGH9), which led to an improved activity on crystalline cellulose.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Objectives. To search for new alkaliphilic cellulases and to improve their efficiency on crystalline cellulose through molecular engineering
Results. Two novel cellulases, BpGH9 and BpGH48, from a Bacillus pumilus strain were identified, cloned and biochemically characterized. BpGH9 is a modular endocellulase belonging to the glycoside hydrolase 9 family (GH9), which contains a catalytic module (GH) and a carbohydrate-binding module belonging to class 3 and subclass c (CBM3c). This enzyme is extremely tolerant to high alkali pH and remains significantly active at pH 10. BpGH48 is an exocellulase, belonging to the glycoside hydrolase 48 family (GH48) and acts on the reducing end of oligo-β1,4 glucanes. A truncated form of BpGH9 and a chimeric fusion with an additional CBM3a module was constructed. The deletion of the CBM3c module results in a significant decline in the catalytic activity. However, fusion of CBM3a, although in a non native position, enhanced the activity of BpGH9 on crystalline cellulose.
Conclusions. A new alkaliphilic endocellulase BpGH9, was cloned and engineered as a fusion protein (CBM3a-BpGH9), which led to an improved activity on crystalline cellulose. |
Assailly, Coralie; Bridot, Clarisse; Saumonneau, Amélie; Lottin, Paul; Roubinet, Benoit; Krammer, Eva-Maria; François, Francesca; Vena, Federica; Landemarre, Ludovic; Dorta, Dimitri Alvarez; Deniaud, David; Grandjean, Cyrille; Tellier, Charles; Pascual, Sagrario; Montembault, Véronique; Fontaine, Laurent; Daligault, Franck; Bouckaert, Julie; Gouin, Sébastien G Polyvalent Transition-State Analogues of Sialyl Substrates Strongly Inhibit Bacterial Sialidases** Article Chemistry – A European Journal, 27 (9), p. 3142-3150, 2021. Résumé | Liens | BibTeX @article{https://doi.org/10.1002/chem.202004672,
title = {Polyvalent Transition-State Analogues of Sialyl Substrates Strongly Inhibit Bacterial Sialidases**},
author = {Coralie Assailly and Clarisse Bridot and Amélie Saumonneau and Paul Lottin and Benoit Roubinet and Eva-Maria Krammer and Francesca François and Federica Vena and Ludovic Landemarre and Dimitri Alvarez Dorta and David Deniaud and Cyrille Grandjean and Charles Tellier and Sagrario Pascual and Véronique Montembault and Laurent Fontaine and Franck Daligault and Julie Bouckaert and Sébastien G Gouin},
url = {https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/chem.202004672},
doi = {https://doi.org/10.1002/chem.202004672},
year = {2021},
date = {2021-01-01},
journal = {Chemistry – A European Journal},
volume = {27},
number = {9},
pages = {3142-3150},
abstract = {Abstract Bacterial sialidases (SA) are validated drug targets expressed by common human pathogens such as Streptococcus pneumoniae, Vibrio cholerae, or Clostridium perfringens. Noncovalent inhibitors of bacterial SA capable of reaching the submicromolar level are rarely reported. In this work, multi- and polyvalent compounds are developed, based on the transition-state analogue 2-deoxy-2,3-didehydro-N-acetylneuraminic (DANA). Poly-DANA inhibits the catalytic activity of SA from S. pneumoniae (NanA) and the symbiotic microorganism B. thetaiotaomicron (BtSA) at the picomolar and low nanomolar levels (expressed in moles of molecules and of DANA, respectively). Each DANA grafted to the polymer surpasses the inhibitory potential of the monovalent analogue by more than four orders of magnitude, which represents the highest multivalent effect reported so far for an enzyme inhibition. The synergistic interaction is shown to operate exclusively in the catalytic domain, and not in the flanked carbohydrate-binding module (CBM). These results offer interesting perspectives for the multivalent inhibition of other SA families lacking a CBM, such as viral, parasitic, or human SA.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract Bacterial sialidases (SA) are validated drug targets expressed by common human pathogens such as Streptococcus pneumoniae, Vibrio cholerae, or Clostridium perfringens. Noncovalent inhibitors of bacterial SA capable of reaching the submicromolar level are rarely reported. In this work, multi- and polyvalent compounds are developed, based on the transition-state analogue 2-deoxy-2,3-didehydro-N-acetylneuraminic (DANA). Poly-DANA inhibits the catalytic activity of SA from S. pneumoniae (NanA) and the symbiotic microorganism B. thetaiotaomicron (BtSA) at the picomolar and low nanomolar levels (expressed in moles of molecules and of DANA, respectively). Each DANA grafted to the polymer surpasses the inhibitory potential of the monovalent analogue by more than four orders of magnitude, which represents the highest multivalent effect reported so far for an enzyme inhibition. The synergistic interaction is shown to operate exclusively in the catalytic domain, and not in the flanked carbohydrate-binding module (CBM). These results offer interesting perspectives for the multivalent inhibition of other SA families lacking a CBM, such as viral, parasitic, or human SA. |